// tested with casperjs v1.1.0-beta3 and phantomjs v1.9.7

var casper = require('casper').create({
    viewportSize: {width: 1024, height: 768}
});
casper.start('https://news.ycombinator.com/', function() {
    this.capture('hackernews-main.pdf');
    var links = this.evaluate(function() {
        var l = document.querySelectorAll("td[class=title] a");
        var r = [];
        for (var i=0; i<l.length; i++) {
            r[r.length] = [l[i].text, l[i].href];
        }
        return r;
    });
    this.each(links, function(self, link_data) {
        self.thenOpen(link_data[1], function() {
            this.capture(link_data[0] + '.pdf')
        });
    });
});

casper.run();